Planning a holiday, driving each others' cars, having a key to your partner's house, being invited to family gatherings, posting a 'loved-up' photo on Facebook, are all signs a relationship is serious and past the 'seeing each other' phase, according to a new survey.

Researchers questioned 2,000 people to reveal the top 50 things which indicate a couple are in a committed relationship. Check out the list below and tell us what you think...

1. Meeting the parents2. Exchanging house keys3. Planning a holiday together4. Discussing plans for the future5. Being invited to family gatherings6. Saying 'I love you'7. Staying overnight at each other's houses8. Signing Christmas / Birthday cards together9. Seeing each other at least every other night10. Leaving a toothbrush at each other's house11. You tell each other absolutely everything12. Letting them take care of you when sick13. Being introduced to wider friendships circles14. Discussing how many children you might want in the future15. Buying a dog or cat together16. Driving each other's cars17. Inviting them to a wedding as a date18. Divulging salary details19. Letting them know your pin number20. Discussing holidays21. Having a drawer at each other's house22. When you HYPOTHETICALLY talk about IF you lived together23. Inviting people round as a couple24. Having clothes and other belongings at each other's houses25. First name terms with their mum and dad26. Talking about intimate health issues27. Farting in front of each other28. Inviting them out with your friends / family29. Receiving cards or gifts addressed to both of you30. When you know what each other's plans are for every single day31. Showering together32. Changing Facebook status to 'in a relationship'33. You know each other's passwords34. Wearing pyjamas when you get home from work35. You share secrets about friends with each other36. Always being the 'plus one' on invites37. Getting food in your big shop just for them38. You start watching TV shows they like39. Phoning each other at work40. Stop putting make up on to look gloriously fresh before they wake up41. When they start asking for your opinion on stuff42. Going out with friends or family without the partner being there43. Signing off 'love' in a card44. You start listening to music they like45. You stop seeing people you know they don't like46. Putting a photo of the two of you on Facebook47. Sending good morning / goodnight texts48. Having a pet name for each other49. Telling each other how many sexual partners you've had50. When all their friends add you on Facebook